Question

The protein products of tumour suppressor gene may

• A. Be present in non-cancerous cells.
• B. Cause signal cell death.
• C. Regulate the cell cycle.
• D. All of the above.

Answer 1

Answer: (A)

Be present in non-cancerous cells.

There are certain proteins produced which are called as check point control proteins. These are also called as protein products of the tumour suppressor genes. These proteins inhibits the process of the cell cycle, when there is some error in the cell cycle stages. These proteins are present in the normal cells. These products are not present in the cancerous cells and thus, there is no inhibition even if there are errors. These proteins allows the cell cycle to be proceeded only when there is no DNA replication error or any other cellular damage.

Thus, the correct answer is option A.